Noise reduction kit for can closing machine

ABSTRACT

The purpose of the machine noise reduction kit is to provide a noise attenuating apparatus for closing machines used for seaming end covers on metal, cardboard, paper or seamable type cans or containers. The reason for developing the noise reduction kit was to protect the machine operator from excessive noise levels as defined by the Occupational Safety and Health Administration better known as OSHA. The kit has been detail designed, fabricated and installed on a can closing machine with a reduction in noise at the operator&#39;&#39;s position from 98 dBA to 86 dBA. In addition to being a noise attenuating device, the use of the kit eliminates the splashing and drainage of spilled product onto the floor around the machine, thereby improving sanitary conditions in the plants.

tates atom [19] [111 3,851,725 Schnell et a1. Dec. 3, 1974 NOISE REDUCTION KIT FOR CAN 3,449,864 6/1969 Prost-Dame 49 477 3,638,359 2/1972 Kruschwitz r 49/490 CLOSING MACHINE 3,723,027 3/1973 Montelius [81/33 K [75] Inventors: Albert C. Schnell, Hickory Hills;

Craig f F Rdge; Primary ExaminerRichard B. Wilkinson Dean chlcago of Assistant Examiner-Vit W. Miska [73] Assignee: Continental Can Company, Inc., Anomey, g P Kerwin; William New York, NY. A- ittman [22] Filed: Sept. 17, 1973 [57] ABSTRACT [21] App]. No.: 398,263

The purpose of the machine noise reduction kit is to provide a noise attenuating apparatus for closing ma- [52] [15; Cl 181/33 K, 49/479, 49/490 chines d for s ing end covers on a card- [51] Int. Cl. F04b 1/99 board, p p or m le ype cans or ontainers. The [58] Field of Search 181/33 K; on f r loping the noise reduction kit was to 419/303-1510, 475 48() protect the machine operator from excessive noise 7 levels as defined by the Occupational Safety and [56] Refere ce Cited 1 Health Administration better known as OSHA. The kit UNITED STATES PATENTS has been detail dle signedhfabricgited and installed onha 1,256,049 2/1918 Schroyer 49/479 can 0 osmg mac me a re m (use at t e 2,567,477 7/1957 Hartbauer 2,679,077 5/1954 lmmel et al 2,808,122 10/1957 Meyers i.

49,479 operators position from 98 dBA to 86 dBA.

49/49() In addition to being a noise attenuating device, the use 8 /3 K of the kit eliminates the splashing and drainage of 2,827,004 3/1958 Luce l8l/33'K spilled product Onto the fl around the machine, 2,898,648 8/1959 Br ght. .4 49/490 thereby improving Sanitary conditions in the plants 3,353,30l l/l967 Herlwerl 49/478 3,378,957 4/1968 Frehse 49/478 7 7 Claims, 10 Drawing Figures PATENTEL DEC 3 4 SHEU 3 OF BACKGROUND OF THE INVENTION In the past closing machines were relatively slow (200 units per minute) and therefore noise levels at the operators position were generally below 90 dBA. Due to advances in technology and the demands for higher production speeds new closing machines are currently operating at 1,200 uits per minute with near future projected goals up to 2,000 units per minute. With these increases in production speed operators are exposed to noise levels approaching I02 dBA or more. According to present guidelines established by the Occupational Safety and Health Administration the operator cannot legally operate machines at this noise level for more than 1 /2 hours of an 8 hour working day. Investigations to locate noise reduction kits for closing machines have failed to turn up applicable solutions.

SUMMARY OF THE INVENTION FIG. 3 shows a cross-section view of the telescoping action between the lower base enclosure and the center wall enclosure;

FIG. 4 shows a cross-section view of the seals used on the side and top edges of the hinged doors;

FIG. 5 shows a cross-section view of the seals used on I the bottom edge-of the hinged doors;

The invention consists of three primary components:

1. Lower base enclosure. 2. Center walls and doors enclosure. 3. Upper electric drive motor enclosure.

The lower base enclosure 1 is secured to the underwhen the upper frame is raised or lowered to accommodate changes in can heights. The lower enclosure 1 overlaps the center enclosure 2 by about 4 inches. The telescoping effect allows an infinite number of can height settings between 3% inches and 6% inches. This also eliminates breaking the seal between the lower base enclosure and the center enclosure while making height adjustments. The benefit of this telescoping seal system is that it reduces the chance of seal damage and it eliminates the .chance of installing the seal incorrectly after each adjustment. Thus, the seal system improves the life of the noise kit by minimizing the growth of noise leaks over the years of operation. Past experience has shown that the effectiveness of noise enclosure is directly related to the durability of seals. The upper electric drive motor enclosure 3 is independent of the lower base enclosure and the center enclosure to the extent that it is not attached-to them. The upper electric drive motor enclosure is required to achieve the 84 dBA level, without it the noise level would be 86 dBA at the operators station.

BRIEF DESCRIPTION OF THE DRAWINGS Further details of the invention will appear from the following description of several embodiments of the invention with reference to the accompanying drawings in which:

FIG. 1 shows a closing machine with the noise reduction kit installed;

FIG. 2 shows a closing machine with the noise reduction kit installed and with the doors and panels in opened position;

noise reduction kit installed and showing container passage openings;

FIG. 9 shows an end view of noise enclosure; and

FIG. 10 shows a cross-section view taken along the line 10l0 of FIG. 9;

DESCRIPTION OF THE PREFERRED EMBODIMENT As seen in FIG. 1 the lower base enclosure 1 approximates the general configuration of the lower machine frame. The lower machine frame itself stands on three legs about 18 inches above the floor (FIG. 1). Frame 4 (FIG. 3) is somewhat like an inverted cup inside of which is a series of gear systems 5 transmitting'power to various drive shafts 6 extending through its top surface. Originally the bottom area of the frame was completely open exposing the gears 7, 8 and thus .allowing noise generated by the gears 'to escape from under the machine.

As seen in FIG. 2 the center side walls 9 and door portion 11 of the center enclosure 2 have the same lower shape as lower enclosure 1. A table type ledge 12 is located at the operators side of the machine so that the original feed stacks l4, 15 for end units 13 can still be used to feed the machine. The center enclosure 2 is the electric drive motor directly fastened to the side walls of the top machine.

frame 10 (FIGS. 1 and 2). The table ledge 12 has frame supports which mount on the machine feed table (not shown) which in turn is an integral part of the top machine frame a noise producing device such as acan closing machine islocated inside the enclosure.

The side walls 9 are made up of 16 gauge sheet metal. For ease of cleaning, a material such as stainless steel may be used as the sheet metal throughout. The inside of the enclosures I and 2 is bare sheet metal and isnot lined with a noise absorbing material. Therefore, due to noise build-up inside, the seams 16 between doors 1] and walls 9 and between enclosures 1 and 2 must have effective seals to stop noise leaks. The reason that no absorbing materials can be used inside is' because such materials are porous in nature and would be a breeding environment for bacteria due to the constant spillage of liquid inside of the machine.

Large access doors 11 are placed on four lateral walls .of the enclosure. These doors are made of l6 g auge sheet metal. They are provided to give maximum access to the inside of the machine in order that operators 1 or maintenance personnel can perform required work on the machine with speed and efficiency. If these doors were not large enough, panels would have to be removed each time access is required to enclosed parts of the machine. It has'been learned that frequent removal of noise enclosure parts accelerates the deterioration of the enclosures effectiveness. This is a result of improper reassembly, wearing out of fasteners and seals and the loss of parts which cause noise leaks. Therefore. the provision of large access doors saves production time and increases the useful life of the enj closure by minimizing maintenance work on the enclosure itself.

The large access side doors 11 were designed to prevent liquid leaks as well as noise leaks.

The top of the table type ledge 12 (FIG. 2) can be removed by flipping four suitcase type latches. Quick removal of this cover is required because of frequent adjustments to the cover feeding system.

The underside of the machine frame is closed off by two steel plates 18 mounted edge to edge, see FIG. 3. These plates 18 enclose frame 4 trapping the gear noise inside the frame compartment 19. Plates 18 are fas tened to the bottom edge of the frame side walls 20 and a neoprene rubber like material isused to provide a' I water tight seal 21 between the frame and plate 18. Seal 21 also acts to reduce the-transmission of vibration energy from the machine frame 4 into the rela tively flexible plate 18. Plate 18 extends past the outer edge of the frame to form the lower surface of enclosure 1. t y

Fastened to the top surface 22 of steel plate 18 (FIG. 3) is the outer side wall 23 and pressure plates 17 which form the. guide system for the telescoping walls 25 of 1 the center enclosure 2. A rubber-like gasket 26 is used to form a water tight seal between surface 22 and the base of side wall 23. The outer side wall 23 is continuous and extends around the entire machine. Each pressure plate 17 is about 2 inches wide and a pressure plate is located every 7 inches behind side wall 23. Plate 17 is welded to the base of wall 23 to maintain a set distance for sealing purposes between the continuous outer side wall 23 and the series of pressure plates 17. Mounted on the top of side wall 23 is an extruded elongated resilient seal 27 with a metal angle protection strip 28. Seal 27fills the clearance gap between side wall 23 and walls 25. Seal 27 may also be resilient material such as sponge or foam. Seal 27 may be made from an elongated flat sheet of elastomeric material folded and having its free edges pressed together between a-leg of the angle strip 28 and the side wall 23. Angle strip 28 is used as a spacer to 'prevent excessive wear. of the seal 27 and to prevent seal 27 from slipping out of position when enclosure 2 is withdrawn. Pressure Fifth, the lower enclosure 1 enables the collection of all spilled liquids to be drained through port 29 into pipe 24 directly to a central drain. This eliminates drainage'dircctly onto the floor around the machine and therefore improves sanitary conditionsand provides safer working conditions for operators and maintainers. I

Seals for the two vertical and the top seams 16 of the side doors 11 are shown in FIGS. 4 and 5. The seal 30 (FIG. 4) may be a hollow resilient elongated tube having a flange extending along its length. It may be resilient material such as sponge or foam. Seal 30 is mounted in an elongated channel member 31 attached to the walls 25 of the center enclosure 2. Channel member 31 acts as a shield to prevent splashing of liquid directly against the seal 30 to reduce the chance of liquid leaks. The seal 30 and channel 31 also provide a labyrinth of passages that noise must travel through in order to leak out of the door seams 16. The labyrinth effect increases the noise reduction of the door seals. A ledge 32 extends around the top and side edge of each door 11 to stiffen the door and to increase the labyrinth effect formed with seal 30 and channel member 31 and to force liquids seeping by seal 30 to drain down door 11. I

The lower edge of the door 11 has a lip 33, shown in FIG. 5, that extends over the lower edge sill 34 ofthe v door entrance. This ensures that liquids running down the inner door surface 35 will drop off lip 33 and into the basin 36 (FIG. 3) formed by enclosure 1. An elastomeric strip 37 is fastened to the outer surface of the bottom edge of the opening in enclosure 2 to seal against noise and liquid leaks through seam 16 (FIG.

The center enclosure 2 has four sages 38 (FIGS. 1 and 2) in Table 12 are used for feeding end units or containers tops 13 into the enclosure. A third passage 39 (FIG. 8) is for bringing unseamed or topless containers into the enclosure. The fourth passage 40 (FIG. 8) is for bringing seamed containers with tops fastened in place out of the enclosure.

The passages 38 for feeding end units 13 into the enclosure are specially designed noise trap and friction sealing tunnels 41 as'shown in FIG. 6. The purpose of tunnel 41 is to provide a seal against noise leakage between stacks 14, 15 of end units 13 which are fed into plate 17 is designed to exert sufficient force on the enclosure wall 25 to ensure proper contact with seal 27. Connected to drain port 29 is a pipe or base used to remove liquids from enclosure 1. These liquids may come from material in the cans which drain from the machine lower frame 4 and from the walls of the enclosure 2.' Lower enclosure 1 serves the following functions: First, the lower enclosing plate 18 traps gear noise inside the lower machine frame cavity.

Second, the side wall 23 and lower plate 18 form the outer walls of the lower enclosurell which with enclosure 2 traps noise of end units and cans inside the machine.

Third, the seal system using items 23, 17, 27, and'28 forms a noise seal which allows enclosure 2 to telescope up and down without disturbing the seal.

Fourth, the lower enclosure '1 not only serves as part of the total noise enclosure but also catches spilled liquids which drain from the machine frame itself and from the walls 25 of enclosure 2.

the enclosure 2 through the table ledge panel 12. The

second purpose is to stop the bounce of an entire stack l4, 15 of end units 13 which results each timean end unit is pulled from the bottom of end feed stack 14, 15. The bouncing can be a significant noise. source if a large number of end units 13 are not kept in the end feed stacks 14 and 15. Each end unit stack 14, 15 is held in place by three guides 42-44 forming a conveyor frame.

The friction sealing tunnel 41 is better shown in FIG. 7. The tunnel sealing function operates to stop noise leaks from the enclosure in two ways. First, a seal between the table top 12 and the tunnel circumference 45 passages. Two pasof a stack of an integral number of end units plus onehalf end unit. A similar seal effect could be achieved by using just one seal. The seal in this case would have to be twice the thickness of one end unit. In this way one end unit is always in the seal passage. The circular hole in the seal is cut to be the same or smaller diameter as the end unit. This allows zero clearance, therefore eliminating a path for noise to leak out when an end unit is in the seal. Since one end unit is always in contact with a seal, there is never a direct path that will allow noise to leak out of the enclosure through tunnel 41.

The reason for using two elastomeric seals 49 and 50 instead of one thick seal is to eliminate bounce of the stack of end units 14 above the tunnel 41. Cover feed screws (not shown) which remove one end unit 13 from the bottom of the stack 14 of units has a 0.040 inch separation lip that causes the end unit above the unit being fed to be lifted 0.040 inches. Since all the end units in the stack are in contact the entire stack of units is lifted 0.040 inches. Because the screw is pulling 600 end units per minute from the bottom of the stack 14, stack 14 in turn bounces 600 times per minute or tries to bounce this fast. As a result, sufficient load or force must be maintained on top of the stack to keep end units on top of the stack from separating and rattling as they bounce. This bounce can result in a noise noise leaks which are known to form with panels when frequently removed.

Fourth, unique shields 31, 33 for access doors prevent direct contact of splashed liquid on seals and creates a labyrinth effect to improve the noise reduction of the seals.

Fifth, the friction sealing tunnel 41 is a multi-purpose noise reduction means in that it: v

a. Seals against noise leaks between the enclosure and tunnel.

b. Seals against noise leaks between the tunnel and end units.

c. Eliminates noise source of the stack of covers bouncing outside of the enclosure.

This apparatus may be used in a variety of infeed situations.

The main electric drive motor 53 mounted on top of the top frame is enclosed in a specially designed noise enclosure 3 as seen in FIG. 1. Enclosure 3 is made of .four pieces as shown by parting lines 54. The enclosure can be removed from the motor 53 in a matter of secsource as high as 90 dBA. By passing the end units 13 through seals 49 and 50, sufficient drag is imposed to noise is trapped inside the tunnel and enclosure 2. v

The passageway for bringing unsealed or topless containers into theenclosure is a tunnel 51 as shown in FIG. 8. Tunnel 51 extends one foot inside the machine from the outer wall up to the point where the covers are placed on top of the containers. Tunnel 51 acts as a baffle or shield to reflect noise back into enclosure 2 and limits the area that noise can enter and thus reduces noise that can escape out of the enclosure.

The passage for removing containers from the enclosure is an opening 52 cut in the wall of enclosure 2 as shown in FIG. 8. There is no tunnel required because the amount of noise that radiates out does not increase the noise levels significantly. This is because the primary noise source is on the opposite side of the machine at the operators station. Thus, the passage is shielded or baffled off by the presence of the machinery inside the enclosure.

The center enclosure 2 serves the following functions: v

First, the side walls, doors and passages along with the lower enclosure 1 form a noise tight enclosure around the primary noise sources of a closing machine togive a significant noise reduction of 12 dBA at the Third, the provision for large access doors saves considerable time for maintenance and does not reduce production. Large access doors also improve the life of the noise enclosure by reducing thedevelopment of onds by releasing six suitcase latches. The enclosure has special passages 55,- 56 to allow ambient air to be supplied to, the motor coolant fan and discharges through separate discharge passages 57, 58. The end view of FIG. 9 shows the motor as located in a bottom shows the air ducts 55 above the 64; top 65 and bottom 66 of the enclosure. This parti-- tion prevents air that has passed through the fan and heated up from recirculating back into the cooling compartment 56. The inside areas'of the passageways 55, 56, 57 and 58 are lined with one inch thick sound absorbing polyurethane foam. The foam absorbs noise created by the fan and from the electric motor. A second partition 67 extends beside the motor almost to the ends of the enclosure. The passageways 55 and 58 were made as along as possible so that a maximum amount of noise could be absorbed before the noise exits from the intake and exhaust ducts 59, 60. To make these passages a maximum length for noise absorption requires that both ports be next to each other. To prevent warm exhaust air from passage 58 from being drawn into the coolant air intake passage 55, the partition 61 was extendedfrom the top of the enclosure to form ducts 59 and 60. a

The upper electric drivemotor enclosure serves the following functions: a a v First, the enclosure givesa 2 dBA noise reduction from 86 to 84 dBA for the closing machine.

Second, the enclosure design is simple and uses the electric motor coolant fan to ventilate the enclosure.

Third, the enclosure can be disassembled in seconds for inspection or maintenance work. Fourth, the enclosure is a unique noise reduction design for self-cooling electric motors or for any type of motor or device which can force draw air for use in an energy conversion device such as to burn with fuel and then exhaust combustion products or heated air away from the energy conversion device. This .design can be used to enclose any type motor as long as the air supply source is kept separate from the exhaust or heated air and the primary engine is used to draw air in and force vides sound abatement without use of noise absorbing materials inside which could not meet sanitary require ments.

Although the present invention has been described in connection with preferred embodiments, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention as those skilled in the art will readily understand. Such modifications and variations are considered to be within the purview and scope of the invention and the appended claims.

We claim:

l. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device comprising: i

a lower continuous outer wall circumscribing said noise producing device extending upward over a portion of the overall height of said machine and having an upper edge; an upper separate outer wall circumscribing said noise producing device in the same fashion as said continuous lower wall and extendingover some of 30 the remaining portion of the overall height of said noise producing device and having a perimeter less than that of said lower continuous wall thereby forming a clearance gap between said lower and 'upper walls and enabling said upper wall to telescope within said lower wall;

elongated resilient means mounted on the periphery of the upper edge of said lower continuous outer wall in such a manner as to occupy said clearance gap; and

at least one pressure plate extending parallel to said lower wall and lying adjacent to and pressing toward said resilient means whereby when said upper wall is engaged into said lower wall said upper wall forces apart said pressure plate from said resilient means whereby said pressure plate forces said upper wall to compress said resilient means forming an air tightand noise blocking seal between said upper'and lower walls but still enabling said walls to telescope freely.

2. A sound proof enclosure having a sliding joint for containing sound emanating from a noisev producing device asset forth in claim lcomprising further:

an angle strip having a first flange and a second flange and mounted along the periphery of the upper edge of said lower wall such that said first flange lies in a direction parallel to said lower wall and overlaps said resilient means, a connecting means securingsaid resilient means to said lower wall, the'second flange is disposed normal in direction to said lower wall thereby shielding the top surface of said resilient means from cuts and abrasions and also serving asa means to retain the resilient means in the clearance gap when said upper Wallis withdrawn from said lower wall. 3. A sound proof enclosure having afsliding joint for containing sound emanating from a noise producing device as set forth in claim 2 inwhich said elongated resilient means comprises:

a flat sheet of elastomeric material folded to form a hollow passage and having its free margins pressed between the saidlower wall and said first flange parallel to said lower wall of said angle strip in such a manner that said second flange'of said angle strip extends over said hollow passage into said clearance gapbetween said lower and upper walls.

4. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 2 in which said elongated resilient means comprises:

a hollow extruded elastomeric tube having a continuous flange extending along its length which may overlap the edge of said lower wall and lie between said wall and said angle strip whereby a bolt may affix said hollow tube to said lower wall.

5. A sound proof-enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 2 in which said elongated resilient means comprises:

a strip of resilientmaterial such as sponge or foam bonded to the inner surface of said lower wall to fill any clearance gap between said lower and upper walls.

6. A sound proof enclosure having a sliding joint for' a bottom wall extending normal to and adjoining the lowest edge of said lower continuous outer wall; 1 a drain pipe located in said bottom wall; and

a means connecting the lowest edge of said lower continuous outer wall to said bottom wall to form an impervious seal between said continuous wall and said bottom wall whereby liquid from said machine collects and discharges through said drain p p 7. A sound proof enclosure having a seal for the top and side seams between a door and the enclosure walls for containing sound and for containing liquid emanating from a noise producing device comprising:

an enclosure having atleast one opening in said enclosure for at least one door;

a U-shaped channel member extending about the inner margin of the top and sides of said opening and protruding into the passageway of said opening such that the backside of said channel faces said machine or noise device; I

a hollow resilient tube mounted in said channel member and traversing the'interior length of said channel member; and r a door extending across said openingand having a margin coextensive with said channel whereby said door presses against said hollow tube to form a sound proof seal and at the same time forms an enclosed passage between said channel and said door within which passage said hollow tube is encased thereby formingan enclosing framework for the hollow tube and shielding said sound proof seal from liquids splashed from said noise device, and

door. v 

1. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device comprising: a lower continuous outer wall circumscribing said noise producing device extending upward over a portion of the overall height of said machine and having an upper edge; an upper separate outer wall circumscribing said noise producing device in the same fashion as said continuous lower wall and extending over some of the remaining portion of the overall height of said noise producing device and having a perimeter less than that of said lower continuous wall thereby forming a clearance gap between said lower and upper walls and enabling said upper wall to telescope within said lower wall; elongated resilient means mounted on the periphery of the upper edge of said lower continuous outer wall in such a manner as to occupy said clearance gap; and at least one pressure plate extending parallel to said lower wall and lying adjacent to and pressing toward said resilient means whereby when said upper wall is engaged into said lower wall said upper wall forces apart said pressure plate from said resilient means whereby said pressure plate forces said upper wall to coMpress said resilient means forming an air tight and noise blocking seal between said upper and lower walls but still enabling said walls to telescope freely.
 2. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 1 comprising further: an angle strip having a first flange and a second flange and mounted along the periphery of the upper edge of said lower wall such that said first flange lies in a direction parallel to said lower wall and overlaps said resilient means, a connecting means securing said resilient means to said lower wall, the second flange is disposed normal in direction to said lower wall thereby shielding the top surface of said resilient means from cuts and abrasions and also serving as a means to retain the resilient means in the clearance gap when said upper wall is withdrawn from said lower wall.
 3. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 2 in which said elongated resilient means comprises: a flat sheet of elastomeric material folded to form a hollow passage and having its free margins pressed between the said lower wall and said first flange parallel to said lower wall of said angle strip in such a manner that said second flange of said angle strip extends over said hollow passage into said clearance gap between said lower and upper walls.
 4. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 2 in which said elongated resilient means comprises: a hollow extruded elastomeric tube having a continuous flange extending along its length which may overlap the edge of said lower wall and lie between said wall and said angle strip whereby a bolt may affix said hollow tube to said lower wall.
 5. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 2 in which said elongated resilient means comprises: a strip of resilient material such as sponge or foam bonded to the inner surface of said lower wall to fill any clearance gap between said lower and upper walls.
 6. A sound proof enclosure having a sliding joint for containing sound emanating from a noise producing device as set forth in claim 1 comprising further: a bottom wall extending normal to and adjoining the lowest edge of said lower continuous outer wall; a drain pipe located in said bottom wall; and a means connecting the lowest edge of said lower continuous outer wall to said bottom wall to form an impervious seal between said continuous wall and said bottom wall whereby liquid from said machine collects and discharges through said drain pipe.
 7. A sound proof enclosure having a seal for the top and side seams between a door and the enclosure walls for containing sound and for containing liquid emanating from a noise producing device comprising: an enclosure having at least one opening in said enclosure for at least one door; a U-shaped channel member extending about the inner margin of the top and sides of said opening and protruding into the passageway of said opening such that the backside of said channel faces said machine or noise device; a hollow resilient tube mounted in said channel member and traversing the interior length of said channel member; and a door extending across said opening and having a margin coextensive with said channel whereby said door presses against said hollow tube to form a sound proof seal and at the same time forms an enclosed passage between said channel and said door within which passage said hollow tube is encased thereby forming an enclosing framework for the hollow tube and shielding said sound proof seal from liquids splashed from said noise device, and a ledge flared from the margin of said door and projecting into said channel to form a buttress for said hollow tUbe when said hollow tube is squeezed by said door as said door is closed and at the same time said ledge, door and hollow tube form a gutter to convey seal seepage toward the bottom of said door. 